Superdensity assembly system for heat exchangers

DETAILED DESCRIPTION What is claimed is: 1.
A coil tube bundle for a heat exchanger which comprises (a) a multiplicity of substantially rigid strips each formed with equally spaced slots inwardly along a front edge thereof and with each slot defining a seat opening through a narrower funnel throat to the front edge of the strip, (b) the strips being parallel to one another with their respective slots aligned in spiral rows and facing in the same direction relative to a central axis of said spiral rows, and (c) flexible tubes of resilient circular cross section spirally disposed across the strips with each tube tightly embraced within the seats of a row of slots to form a coiled interconnected grid of rigid strips and flexible tubes with convolutions of each tube contacting and being spaced apart by rear edges of the strips opposite the front edges and with the tubes supported at substantially equal intervals throughout their lengths.
2.
A tube bundle according to claim 1 wherein the tube bundle is contained between a cover and a bottom of a tank with opposite ends of the strips aligned and abutting the cover and bottom, the bundle being emersed in a liquid phase-change material which is expandable upwardly toward the cover upon freezing.
3.
A tube bundle according to claim 1 wherein the rear edges of the strips in the bundle face inwardly toward the central axis.
4.
A tube bundle according to claim 1 wherein the front edges of the strips in the bundles are spaced from the tubes.
5.
A multiple plastic tube, coiled tubing bundle heat exchanger for use in a tank for containing phase change material (PCM) which becomes frozen during extraction of heat and which becomes melted during addition of heat comprising: a multiplicity of individual horizontally extending plastic tubes all having an outside diameter (O.
D.
) in the range from 9/32ths of an inch (0.
28125 in.
) to one inch, a multiplicity of relatively rigid, thick, vertical plastic strips having an overall length L comparable with the internal height of the tank in which the coiled tubing bundle is to be placed and having front and rear edges and with the upper and lower ends of each strip for positioning near the cover and bottom of the tank, each of said strips having generally uniformly spaced tube-capturing slots extending inwardly from its front edge, each tube capturing slot terminating in a seat opening having an effective size for firmly gripping the O